This is a great idea. Gone are the days when you could just place a "S" hook under your car or truck and tie your canoe to it. I did the same with two cars that I own and it has work wonderfully. The belts just fold back under the hood or flop back into your trunk. I used body fender bolts. Took the bolts out, put the bolts through the webbing and replaced the bolts.
Pull-Up Strap Handle Kit
Canoe Pack Liner